Gearing



June 25, 1934- y L. A. cowLEs El AL 1,964,251

GEARING Filed May 10, 1953 2 Sheets-Sheet l Leo flCawles a, v WilfredTCaw'Zes h ormdn rocTor Kg W72 June 1934. L. A. COWLES El AL GEAR I NGFiled May 10, 3933 2 Sheets-Sheet 2 3mm;- Lea l. COW (e5 W/(fr'edfCowles A or man Procfor rotatable and slidable the rods or tracks beingPatented June 26, 1934 UNITED STATES PATENT OFFICE GEARING ApplicationMay 10, 1933, Serial No. 670,256

9 Claims.

The present invention relates to gearing and more particularly to gearedfeeding mechanism.

The main objects of the invention are to provide a novel type of drivingshaft geared to a driven shaft; to provide a spur gear driving shafthaving a worm cut in the teeth thereof and geared to a driven shaft forrotating and sliding the driven shaft; and, to provide a novel type ofgeared feeding mechanism of the general character above indicated.

An illustrative embodiment of the invention is shown in the accompanyingdrawings, wherein:

Figure 1 is a front elevational view of the geared feeding mechanismhere shown as adapted for use in conjunction with a carbon stick feedingdevice of an arc lamp;

Figure 2 is a sectional view thereof on line 2--2 of Figure 1;

Figure 3 is a perspective view of the driven shaft of the mechanism,including the tensionally retained positive carbon stick;

Figure 4 is an enlarged sectional view on line 4-4 of Figure 1;

Figure 5 is a sectional view on line 5-5 of Figure 4;

Figure 6 is an end view of a portion of the device showing the meanswhereby one set of the driven teeth are tensionally swung out of meshwith the worm of the driving shaft;

9 Figure 7 is a sectional view on line '7--7 of Figure 4;

Figure 8 is a sectional view on line 8-8 of Figure 6; and

Figure 9 is a fragmentary view of the worm meshing driven teeth.

The particular embodiment of the invention herein shown and described ishere illustrated as used in conjunction with a carbon stick feedingmechanism of an arc lamp such as are used in motion picture projectionmachines. It is to be understood however that the geared mechanism isapplicable for use in conjunction with other structures than that whichis herein shown and described.

Referring then to the drawings in which like parts are designated by thesame numerals in the several views, the structure generally comprises avertically disposed hollow arm 1 forming a housing for the drive shaft 2whose function 5 is hereinafter more particularly described. Thisvertically disposed arm likewise provides a support for a pair oflaterally projecting spaced rods or tracks 3, 4 which are rigidlysecured thereto in any suitable manner, the outer ends of held in spacedrelation by a triangularly formed plate or bracket 5 and the nuts 6. Arotatable driving shaft '7, journalled in bearings at the upper end ofthe arm 1 and in the plate or bracket 5, is disposed intermediate therods or tracks 3, 4 and in parallelism therewith, the inner end of theshaft having a tooth gear member 8 meshing with the worm 9 of the driveshaft 2.

This driving shaft 7 is provided with a plurality of radially disposedspur teeth 10 cut thereon and with a worm 11 helically cut in the spurteeth as best illustrated in Figure 5.

A feed element 12, here shown as bifurcated, is slidably secured to andretained interjacent the rods or tracks 3, 4 and a driven shaft 13, hereshown as tubular, is journalled in the bifurcated portions of the feedelement which form a housing for a gear wheel 14 mounted on the drivenshaft and whose teeth 15 mesh with the radially disposed spur teeth 10of the driving '75 shaft 7.

The tubular driven shaft is here shown as clamping means for thepositive .carbon stick 16 which is inserted therethrough and tensionallyretained therein by means of the screw threaded s0 washer 17 screwed tothe split screw threaded free end of this tubular driven shaft. Theinner end of this carbon stick 16 is spaced from the negative carbonstick 1,8 .as best shown in Figure 1 and suitable electric lead wires 19are secured to the carbon sticks in any desired manner as by the clamps20 to furnish electricity for the arc.

A member .21 slidably and rotatably embracing the rod or track 4interjacent the depending arms of the bifurcated feed-element 12 isprovided with a projecting finger 22 having teeth 23 on its innersurface meshing with the worm 11 on the driving shaft 7, and a helicalspring 24 secured at one end to the stud 25 on the feed element 12 andat its other end to the lug 26 on the finger 22, tensionally retains thefinger teeth in mesh with the worm during normal operation of the devicebut permits the finger teeth to be swung out of mesh with the worm whenit is desired to slide the feed element 12 in instances wherein it isdesired to replace new carbon sticks or otherwise reset the feedelement.

As heretofore suggested, the embodiment of the invention herein shownand described is illustrated as used in conjunction with a carbon stickfeeding mechanism of an arc lamp such as are used in projectionmachines. The positive carbon sticks of an arc lamp are gradually burnedup in use and the geared feeding mechanism herein shown and describednot only feeds the positive carbon stick in proper spaced relation toits negative stick but also causes the positivestick to rotate in itsfeeding movement.

In operation, rotation of the drive shaft 2 whose worm 9 meshes with theworm gear 8 causes the driving shaft 7 to rotate. Rotation of thedriving shaft 7 whose worm 11 meshes with the worm gear 22 of the feedelement 12 and whose spur teeth mesh with the gear teeth 15 of thedriven shaft 13 carried by the feed element 12 causes the driven shaft13 to not only rotate but also move forwardly to feed the carbon stick16.

We claim:

1. In a gear mechanism, a rotatable shaft having radially disposed spurteeth out thereon and a worm cut in the spur teeth, a track disposedparallel with said shaft, and an element slidably mounted on said trackcarrying a member having teeth meshing with said worm and a secondmember having teeth meshing with said spur teeth whereby said secondmember is caused to slide and rotate by the rotation of said shaft.

2. In a gear mechanism, a rotatable shaft, means for rotating saidshaft, said shaft having radially disposed spur teeth out thereon and aworm cut in the spur teeth, a track disposed parallel with said shaft,and an element slidably mounted on said track carrying a member havingteeth meshing with said worm and a second member having teeth meshingwith said spur teeth whereby said second member is caused to slide androtate by the rotation of said shaft.

3. In a gear mechanism, a rotatable shaft, means for rotating saidshaft, said shaft having radially disposed spur teeth out thereon and aworm cut in the spur teeth, and a device having a member provided withteeth meshing with said spur teeth and another member provided withteeth meshing with said worm.

4. In a structure of the class described, a driving shaft havingradially disposed spur teeth out thereon and a worm cut in said spurteeth, a shaft supporting element slidably mounted with respect to thedriving shaft and (1) carrying a driven shaft provided with teethmeshing with said spur teeth and (2) supporting a tensionally swingablemember provided with teeth meshing with said worm whereby the drivenshaft is caused to slide and rotate by the rotation of the drivingshaft.

5. In a structure of the class described, a driving shaft havingradially disposed spur teeth out thereon and a worm cut in said spurteeth, a track disposed parallel with said driving shaft and carrying afeed element thereon, said feed element comprising (1) a driven shaftwhose one end is provided with teeth meshing with said spur teeth andwhose other end is provided with a clamp for feeding detachably securedstock, and (2) a tensionally swingable member provided with teethmeshing with said worm whereby the driven shaft is caused to slide androtate by the rotation of the driving shaft.

6. In a structure of the class described, a driving shaft havingradially disposed spur teeth out thereon and a worm cut in said spurteeth, a shaft supporting element slidably mounted with respect to thedriving shaft and (1) carrying a driven shaft provided with teethmeshing with said spur teeth and (2) supporting a member provided withteeth meshing with said worm whereby the driven shaft is caused to slideand rotate by the rotation of the driving shaft.

7. In a structure of the class described, a driving shaft havingradially disposed spur teeth out thereon and a worm cut in said spurteeth, a track disposed parallel with said driving shaft and carrying afeed element thereon, said feed element comprising (1) a driven shaftwhose one end is provided with teeth meshing with said spur teeth andwhose other end is provided with a clamp for feeding detachably securedstock, and (2) a member provided with teeth meshing with said wormwhereby the driven shaft is caused to slide and rotate by the rotationof the driving shaft.

8. A rotatable cross-sectionally circular element having radiallyextending gear teeth arranged in a series winding helically about theaxis of said element and also arranged in a plurality of parallel seriesinclined relatively to said helical series, an element mounted forlongitudinal movement parallelly with the axis of the firstmentionedelement and having teeth meshing with the teeth thereof, an elementmounted for rotative movement about an axis parallelly disposedrelatively to the axis of the first-mentioned element and having teethmeshing with the teeth thereof.

9. In a gear mechanism, a rotatable shaft having radially disposed spurteeth out thereon and a helical worm continuously cut in the samedirection across the spur teeth, and a device slidably mounted withrespect thereto having a member provided with teeth meshing with theworm and having another member provided with teeth meshing with saidspur teeth.

LEO A. COVVLES. WILFRED F. COWLES. NORMAN J. PROCTOR.

